夏威夷两个非常相似的中型供水系统最近的经验提供了一个 案例研究:反向块率结构在帮助促进保护方面的作用。这个 夏威夷县供水局（Hawai'i DWS）为当地居民提供饮用水 岛上约有36600名住宅、商业和农业客户 夏威夷。考艾县水资源部（考艾道）服务于大约 考艾岛上有18400名住宅、商业和农业客户。 2001年7月，两个供水系统都大幅提高了供水率（目前约为29%） 夏威夷DWS和大约32%的Kaua’i DOW）为大量资本提供资金 每个岛都需要改进。然而，这两个系统之间的一个主要区别是， 是他们的利率结构。夏威夷DWS在所有这些方面都保持了反向块率结构 它的客户已经超过20年了。Kaua'i道琼斯指数之前的汇率是统一的（持平的） 结构，并于2001年为其客户启动了一个反向阻塞率结构。虽然 这两个公用事业公司在许多方面（包括客户资料和总体天气）相似 条件），初步审查客户对这两次大幅提价的反应 表明Kaua'i DOW的用水量比夏威夷DWS的用水量显著减少 从2001年开始。 本文比较了夏威夷DWS和Kaua'i DOW自2001年以来的用水经验 2001年。特别是，本文审查并量化了实施 2001年，Kaua'i DOW的反向块率结构。澳大利亚用水模式综述 提出这两种水系统是为了比较Kaua’i DOW是否从统一速率转换 结构为逆块率结构，与水的显著变化相对应 需求模式，以及这些变化是否与夏威夷DWS不同。明确地 本文考虑了初始转换为反向块速率结构的假设 可以降低耗水量，但一旦建立了反向阻塞率结构， 费率结构的进一步变化对用水量的影响较小。这些和其他价格 本文讨论了相关的水资源保护问题。包括表格、数字。

The recent experience of two very similar medium-sized water systems in Hawai'i provides a case study in the role of an inverted block rate structure in helping to promote conservation. The County of Hawai'i Department of Water Supply (Hawai'i DWS) serves potable water to approximately 36,600 residential, commercial, and agricultural customers on the island of Hawai'i. The County of Kaua'i Department of Water (Kaua'i DOW) serves approximately 18,400 residential, commercial, and agricultural customers on the island of Kaua'i. In July 2001 both water systems implemented large rate increases (approximately 29 percent at Hawai'i DWS and approximately 32 percent at Kaua'i DOW) to fund significant capital improvements needed on each island. A major difference between the two systems, however, was their rate structures. Hawai'i DWS has maintained an inverted block rate structure for all of its customers for more than two decades. Kaua'i DOW previously had a uniform (flat) rate structure and in 2001 initiated an inverted block rate structure for its customers. Although the two utilities are similar in many aspects (including customer profiles and overall weather conditions), a preliminary review of customer reactions to these two large rate increases suggested a more significant reduction in water usage at Kaua'i DOW than at Hawai'i DWS since 2001. This paper compares the water usage experiences at Hawai'i DWS and at Kaua'i DOW since 2001. In particular, the paper examines and quantifies the effect of implementing an inverted block rate structure at Kaua'i DOW in 2001. A review of water consumption patterns at the two water systems is presented to compare whether Kaua'i DOW's switch from a uniform rate structure to an inverted block rate structure corresponded with significant changes in water demand patterns, and if these changes are different from those at Hawai'i DWS. Specifically, this paper considers the hypothesis that an initial conversion to an inverted block rate structure can reduce water consumption, but then, once an inverted block rate structure is established, further changes in rate structure have less impact on water consumption. These and other rate related water conservation topics are addressed in the paper. Includes tables, figures.